ATP Houston Qual 04/07 21:25 26 [145] Bellucci, Thomaz v Stefan Kozlov [182] 7-6,3-6,6-7
Miami, USA, Qualifying 03/19 17:40 44 [105] Cameron Norrie v Stefan Kozlov [167] Retired
Indian Wells, USA, Qualifying 03/07 00:05 44 Stefan Kozlov v Menendez-Maceiras, Adrian 2-6,6-7
Challenger - Indian Wells 02/28 18:00 26 Polansky, Peter v Stefan Kozlov 6-2,6-4
Challenger - Indian Wells 02/27 19:30 25 Stefan Kozlov v Mirza Basic 7-5,6-4
ATP Delray Beach Qual 02/17 18:50 26 Stefan Kozlov v Ramkumar Ramanathan 3-6,2-6
Challenger Dallas 01/31 03:40 25 Stefan Kozlov v Frances Tiafoe 2-6,6-7
Newport Beach, USA 01/24 18:00 26 Stefan Kozlov v Miomir Kecmanovic 3-6,4-6
Newport Beach, USA 01/22 19:55 25 Clezar, Guilherme v Stefan Kozlov 2-6,3-6
Australian Open Qual 01/13 23:00 46 Stefan Kozlov v Brown, Dustin 4-6,6-3,3-6
Australian Open Qual 01/11 06:20 45 Yannick Hanfmann v Stefan Kozlov 6-4,6-7,4-6
Australian Open Qual 01/09 23:00 44 Stefan Kozlov v Blake Ellis 7-6,4-6,7-6
Challenger Noumea 01/01 08:30 25 Stefan Kozlov v Corentin Moutet 6-7,6-3,2-6
Challenger Knoxville 11/08 16:20 25 [131] Stefan Kozlov v Smyczek, Tim [158] 6-7,2-6
Challenger Charlottesville 11/04 18:55 28 [135] Stefan Kozlov v Smyczek, Tim [189] 3-6,6-2,2-6
Challenger Charlottesville 11/03 19:30 27 [135] Stefan Kozlov v Denis Kudla [206] 6-4,6-3
Challenger Charlottesville 11/02 23:40 26 [135] Stefan Kozlov v Liam Broady [170] 6-4,4-6,6-4
Challenger Charlottesville 10/31 22:50 25 Stefan Kozlov v Thai-Son Kwiatkowski 6-1,3-6,6-3
Challenger Las Vegas 10/22 20:35 29 [137] Stefan Kozlov v Liam Broady [196] 3-6,7-5,6-4
Challenger Las Vegas 10/21 19:45 28 [94] Tennys Sandgren v Stefan Kozlov [137] 3-6,6-7
Challenger Las Vegas 10/20 18:00 27 [137] Stefan Kozlov v King, Kevin [215] 6-2,6-3
Challenger Las Vegas 10/18 18:00 26 [137] Stefan Kozlov v Dominik Koepfer [245] 6-4,6-1
Challenger Las Vegas 10/16 20:45 25 [137] Stefan Kozlov v Aragone, JC [421] 7-5,6-3
Challenger Fairfield 10/10 19:00 25 [142] Stefan Kozlov v Mackenzie McDonald [218] 4-6,7-5,1-6
Challenger Stockton 10/06 17:00 27 [144] Stefan Kozlov v Darian King [207] 4-6,4-6
Challenger Stockton 10/04 17:00 26 [144] Stefan Kozlov v Denis Kudla [166] 6-4,6-4
Challenger Stockton 10/02 20:40 25 [144] Stefan Kozlov v Schnur, Brayden [211] 6-3,6-2
US Open, New York, USA, Qualifying 08/22 19:55 44 [150] Guido Andreozzi v Stefan Kozlov [141] 6-4,6-1
Cincinnati, USA 08/14 19:20 24 [133] Stefan Kozlov v Querrey, Sam [20] 3-6,0-6
Washington, USA 07/31 20:00 24 [132] Stefan Kozlov v Bhambri, Yuki [200] Retired

Wikipedia - Stefan Kozlov

Stefan Kozlov (Russian: Стефан Козлов, STEF-ahn KOZ-lov; born February 1, 1998) is an American professional tennis player of Russian descent. He has a career-high ATP ranking of world No. 103 achieved on 18 July 2022 and doubles ranking of world No. 180 on 19 June 2017.

Kozlov made his ATP World Tour debut as a wildcard in 2013 Hall of Fame Tennis Championships at the age of 15. He reached two junior Grand Slam finals in 2014 and finished the year at World No. 3 in the ITF Junior Combined rankings.